Finding source/drain capacitance of a mosfet using LTspice

Status
Not open for further replies.
D

dsrinivasrao

Member level 1
Joined
Oct 9, 2011
Messages
39
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
1,652
Hi,Can somebody tell me how to extract source capacitance Cs of a mosfet using spice simulation.??Its very necessary for my thesis
 

Do you mean drain-source capacitance, Cds? I am not quite sure what you mean by source capacitance. Can you clarify?
If it is drain-source capacitance, maybe you can setup a switching test and see rising/falling behavior and associate it with capacitance.
 

Hi,
I want to know is there any specific way to calculate Cg,Cs,Cd of a Mos transistor..Also like in a digital inverter with a ratio 2:1 we say that the output capacitance is 3C and the delay is T(tow)=3RC and for a 180nm technology this product of RC is approx 15ps as given in Weste & Harris.

So if I want to find the RC product for a 90nm or 45nm technology what should I do??..Can you plz explain me in detail.....
 

It seems like this is something that needs to be extracted from the layout tool. I think it will depend on the actual geometry of the device. I don't think it is enough just to know that it is 90 or 45nm.

v_c
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…